The purpose of Sweave is to make statistical analyses reproducible. Data recovery on mac However, technical difficulties can keep the Sweave document from being itself reproducible. Data recovery kali linux Here are some things that could go wrong.
When you launch Sweave from an R session, Sweave inherits your session state. I card data recovery Any libraries that are loaded, any variables defined, etc. Database name This makes it easy to mislead yourself into thinking that an Sweave file is self-contained, when in fact it implicitly depends on session state.
You can protect yourself by running Sweave in batch mode or starting a new session before running Sweave. Database quiz Here’s a batch file to run Sweave from a Windows commandline. Database url Assuming R and pdflatex are in your path, you can save this code to a file, say sw.bat, and process a file foo.Rnw with the command sw foo. Os x data recovery free R.exe -e “Sweave(‘%1.Rnw’)”
However, it’s still possible that someone else receiving your Sweave file will could start Sweave with a session state that interferes with your file. Fda 510 k database One precaution would be to include sessionInfo() and ls() R commands at the top of your file. Database research That wouldn’t prevent contamination, but it would make it obvious.
A more aggressive approach would be to include something like the command rm(list=ls()) at the top of the file to clean out the environment. Graph database That would be effective, but might upset the person running Sweave. Data recovery android free You could also put the rm command at the bottom of your file to clean out the changes that Sweave makes to the environment that launched it. Database software Missing R packages
The Sweave package itself may be missing from R, although it is now a standard part of the R distribution. Database software definition (At least as of version 2.4.1, possibly further back.)
Installing a package depends on where it came from. Database error 7719 at exe Standard R packages can be installed from CRAN. Data recovery nj These are trivial to install from the R user interface by clicking on the Packages menu.
Do not install BioConductor packages by going to the BioConductor site and manually downloading files. Iphone 6 data recovery mac For one, the search feature is buggy (as of February 2007). Database design tool For another, the automatic installation options make sure the right version is downloaded along with its dependencies.
Other packages, such as OOMPA for example, are distributed as binary libraries. H data recovery software To install such libraries, first save the binary files to your local disk. 1 care data recovery software Then from the Packages menu select “Install package(s) from local zip files…”
MiKTeX version 2.5 does an excellent job of automatically installing LaTeX packages as needed. Database user interface Installing packages with earlier versions was much more work. Data recovery jaipur Missing or modified data
One way to reduce the problem of missing data would be to have a version control system or at least a standard file system location for data sets. Database platforms The Sweave file could extract the data from version control as its first step.
Modifications to data can be detected by a checksum. Data recovery group An Sweave document could assert the checksum of the data file before doing any further processing. Database xls Referenced files and paths
Complex LaTeX files often reference external files, assuming a given location for these files. C database library Absolute paths are not portable, unless everyone organizes their local hard disk the same way. 510 k database Such standardization might work within an organization, with effort, but will not work if you want to share files with the world at large. How to become a database administrator With relative paths, you can zip up your main file and all its dependencies, and anyone who unzips the bundle will have the file structure they need.
Unfortunately, Sweave hard-codes the absolute path to its style files in its LaTeX output. Database xml The path to the style files depends on where R was installed on the local system. Database terminology This means that while an Sweave document may be portable, the LaTeX file it produces is not. Database theory If you receive a LaTeX document produced by Sweave on someone else’s computer, you will need to edit the path inside the \usepackage statement so that it points to the Sweave style file location on your computer. Database 1 to 1 relationship If you want to give your LaTeX file to someone who does not have R, you can delete the reference to Sweave and paste in the contents of the Sweave.sty file.
If R is installed under “Program Files”, you will not be able to run LaTeX even on your own Sweave output without modification. Database testing Since the path to your R installation contains spaces, Sweave will insert a DOS-mangled path that LaTeX will choke on. Database graph Installing R in a location without spaces in the path, something like C:\bin\R, avoids the problem. Database naming conventions Compiling to LaTeX
Once everything is set up, you can compile an Sweave file to LaTeX by calling Sweave from R with the program file as an argument. Database entity For example, Sweave(“C:/temp/foo.Rnw”). Database developer This will produce a LaTeX file foo.tex, but the file may not appear where you expect. Data recovery plan Rather than creating the file in the same directory as its source, R drops the file in R’s current working directory.